context/profile has no required fields

## What are the schemas that are affected by the issue
context/profile

The schema today does not specify any required fields. Shouldn't a Profile record require an identities value?

Inspect the context/profile schema and its current field definitions, focusing on whether identities is present and how required fields are represented. Compare the schema with the issue's expectation that a Profile record requires identities; done means the schema declares that requirement and its validation behavior is covered.

Written by the indexing model from the issue text.